diff --git a/entities/storage_entity.cpp b/entities/storage_entity.cpp
index 31f34d6..d0da1d2 100644
--- a/entities/storage_entity.cpp
+++ b/entities/storage_entity.cpp
@@ -20,6 +20,42 @@ const QVector<cargo_entity> storage_entity::cargo() {
     return this->_cargo;
 }
 
+void storage_entity::add_cargo(cargo_entity object, bool &success) {
+    success = ((int)this->_capacity - (int)object.volume()) > 0;
+    if (success) {
+        this->_cargo.push_back(object);
+        this->_capacity -= object.volume();
+    }
+}
+
+cargo_entity storage_entity::get_cargo(unsigned long long oid, bool &found) {
+    cargo_entity ent;
+    found = false;
+
+    auto vit = this->_cargo.begin();
+    for (; vit != this->_cargo.end(); vit++) {
+        if ((*vit).id() == oid) {
+            ent = *vit;
+            found = true;
+            break;
+        }
+    }
+    return ent;
+}
+
+void storage_entity::withdraw_cargo(unsigned long long oid, bool &success) {
+    success = false;
+    auto vit = this->_cargo.begin();
+    for (; vit != this->_cargo.end(); vit++) {
+        if ((*vit).id() == oid) {
+            this->_capacity += (*vit).volume();
+            this->_cargo.erase(vit);
+            success = true;
+            break;
+        }
+    }
+}
+
 void storage_entity::serialize(QDataStream &output) {
     output << this->_id << this->_capacity << this->_cargo.size();
     for (auto item : this->_cargo) {
diff --git a/entities/storage_entity.h b/entities/storage_entity.h
index 40210fe..c4285e0 100644
--- a/entities/storage_entity.h
+++ b/entities/storage_entity.h
@@ -24,6 +24,10 @@ public:
     unsigned int capacity();
     const QVector<cargo_entity> cargo();
 
+    void add_cargo(cargo_entity object, bool &success);
+    cargo_entity get_cargo(unsigned long long oid, bool &found);
+    void withdraw_cargo(unsigned long long oid, bool &success);
+
     void serialize(QDataStream &output);
     void deserialize(QDataStream &input);
 };